Keywords HIV infectioninterrupted time series analysismen who have sex with men (MSM)population surveillancepre-exposure prophylaxis (PrEP) Information Type Original Paper Information Epidemiology & Infection , Volume 154 , 2026 , e18 Creative Commons This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article...